/*
 * @lc app=leetcode.cn id=509 lang=cpp
 *
 * [509] 斐波那契数
 */
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>

using namespace std;
// @lc code=start
class Solution {
public:
     int fib(int n) {
        if(n == 0) 
            return 0;
        if(n == 1) 
            return 1;
        return fib(n-1)+fib(n-2);

     }
};
// @lc code=end

